I'm not clear, is it a defense equal to B rank NPs or B rank regular attacks?
Anyway I'm pretty sure George would've had the advantage over Siegfried in the original Apo. Although if AoF takes a B rank NP chunk out of anti-dragon attacks George might not be able to get through it. If it's only B rank regular attacks, George is the clear winner because he can block/tank everything Siegfried has while the reverse isn't true.